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//
// Copyright 2017, 2018 Filippo "Fil" Bergamo <fil.bergamo@riseup.net>
//
// This file is part of RepWifiApp.
//
// RepWifiApp is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// RepWifiApp is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with RepWifiApp. If not, see <http://www.gnu.org/licenses/>.
//
// ********************************************************************
package fil.libre.repwifiapp.helpers;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.TimeoutException;
public class ShellCommand {
public static final int EXITCODE_INVALID_INPUT = -9;
public static final int EXITCODE_PARSING_ERROR = 999;
public static final int MIN_TIMEOUT_MILLIS = 100;
protected String _cmdOut = "";
protected String _cmdTxt = "";
public ShellCommand(String commandText) {
this._cmdTxt = commandText;
}
public int execute() throws Exception {
if (this._cmdTxt == null) {
return EXITCODE_INVALID_INPUT;
}
Logger.logDebug("EXEC: " + this._cmdTxt);
Process cmd = Runtime.getRuntime().exec(this._cmdTxt);
InputStream os = cmd.getInputStream();
InputStream es = cmd.getErrorStream();
StringBuilder sb = new StringBuilder();
sb.append(getStringFromStream(es));
sb.append(getStringFromStream(os));
int res = cmd.waitFor();
// re-read the output, in case it was empty when first tried
sb.append(getStringFromStream(es));
sb.append(getStringFromStream(os));
this._cmdOut = sb.toString();
Logger.logDebug("EXITCODE: " + res);
Logger.logDebug("OUT: " + getOutput());
return res;
}
protected String getStringFromStream(InputStream s) throws IOException {
java.util.Scanner sc = new java.util.Scanner(s,"UTF-8").useDelimiter("\\A");
return sc.hasNext() ? sc.next() : "";
}
public String getOutput() {
return this._cmdOut;
}
protected class ProcessTimeout{
private Process _proc;
private int _exitCode;
private boolean _hasExited = false;
private InterruptedException e = null;
public int waitFor(Process p, long timeoutMillis) throws InterruptedException, TimeoutException{
// waits for a maximum of timeoutMillis milliseconds
// for the process to exit.
int msWaited = 0;
this._proc = p;
startWaitingForProcess();
while (msWaited < timeoutMillis) {
if (e != null){
// exception from the underlying thread;
throw e;
}
if (! _hasExited){
Thread.sleep(MIN_TIMEOUT_MILLIS);
msWaited += MIN_TIMEOUT_MILLIS;
} else {
return _exitCode;
}
}
throw new TimeoutException("Timeout elapsed while waiting for inner process to finish its execution.");
}
private void startWaitingForProcess(){
new Thread(new Runnable() {
public void run(){
try {
int exitCode = _proc.waitFor();
setExitCode(exitCode);
} catch (InterruptedException e) {
setException(e);
}
}
}).start();
}
private void setExitCode(int ec){
_hasExited = true;
_exitCode = ec;
}
private void setException(InterruptedException e){
this.e = e;
}
}
}
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